25561951 has 8 divisors (see below), whose sum is σ = 25977600. Its totient is φ = 25148760.

The previous prime is 25561891. The next prime is 25561969. The reversal of 25561951 is 15916552.

25561951 = T₄₈₈ + T₄₈₉ + ... + T₆₄₅.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25561951 - 2⁹ = 25561439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38460 + ... + 39118.

It is an arithmetic number, because the mean of its divisors is an integer number (3247200).

Almost surely, 2^25561951 is an apocalyptic number.

25561951 is a deficient number, since it is larger than the sum of its proper divisors (415649).

25561951 is an equidigital number, since it uses as much as digits as its factorization.

25561951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229.

The product of its digits is 13500, while the sum is 34.

The square root of 25561951 is about 5055.8828111419. The cubic root of 25561951 is about 294.5764332057.

The spelling of 25561951 in words is "twenty-five million, five hundred sixty-one thousand, nine hundred fifty-one".